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Standard Model A Brief Description by Shahnoor Habib History of Particle Physics Earliest times - 1550 AD: The Ancients 1550 - 1900 AD: The Scientific Revolution and Classical Mechanics 1900 - 1964 AD: Quantum Theory 1964 - Present: The Modern View (the Standard Model) Introduction • Standard Model – a framework to explain elementary particles. – Electromagnetism – Weak interaction – Strong interaction • SM does not include gravity. • Biggest success of Standard model – unification of weak and electromagnetism. Particle Physics Prior to Accelerator • Discovery of electron • Rutherford scattering experiments led to discovery of nucleus and proton • Planetary model of atom • Quantum Mechanics and development of Charge cloud mode of atom Planetary model of atom The Cloud Charge Model Motivation for the invention of Accelerator Questions already answered Atomic spectra and orbits of electrons Nuclear isotopes Questions pending What is the force behind radioactive decay that produce alpha particles, beta particles and gamma rays? Why protons in the nucleus do not burst out because of electromagnetic repulsion? Enter the Accelerator Role of Accelerator in the development of Standard Model High speed particles Small wavelength associated with particles Particle Zoo More than 100 new particles were discovered Accelerator Introduction to Quarks The Quark Proposal Gellmann and Zweig Quarks and antiquarks Fractional charges Quarks can not be seen individually Experimental evidence for the presence of quarks Fundamental matter particles according to SM •Baryons are made of three quarks and have half integral spin of h bar. •Mesons are made of quark and antiquark and have 0,1,2, .. spin of h bar. Unseen Effect Fundamental Interactions • Electromagnetism – Force carrier of Electromagnetism – Role of Electromagnetism in the formation of atom – Why atoms combine to form molecules when atom itself is a neutral entity? • Weak Interaction – Role of weak interaction in the decay of higher mass particles – Range of weak interaction • Strong Interaction – Role of strong interaction in the formation of hadrons – Color and strong interaction – Range of strong interaction – Why nucleons join to form nucleus when a nucleon is colorless? Unification of Weak Interaction and Electromagnetism • Weinberg, Salam, and Glashow • Force carrier particles – W, Z and photons • Masses of force carrier particles and symmetry breaking. • Temperature range where weak and EM are one force. Timeline of the Universe - Standard Model Time since 0 Event Description Temperature 15 x 109 yrs Now Galaxies, stars, planets, and us 109 yrs ? Galaxy formation bulges and halos of normal galaxies 20 K form 106 yrs Microwave Background recombination - transparent to photons 3000 K 3 min Nucleosynthesis light elements formed 109 K 6 sec Electron-Positron pairs creation of electrons 6 x 109 K 2 sec Neutrinos decouple 1010 K creation of neutrino background 3K 2 x 10-6 sec Proton-Antiproton pairs creation of nucleons 1013 K 2 x 10-10 sec Electroweak unification E-M and weak force same 1015 K 10-35 sec ? Inflation universe exponentially expands by 1026 1027 K 10-35 sec Grand Unification E-M/Weak and Strong forces same 1027 K 10-44 sec Quantum Gravity Unification of all 4 forces 1032 K No concept of space or time? > 1032 K < 10-44 sec Planck Era Questions remaining for Standard Model • Three family of quarks • Why the need for two other family when we see only the fist family in nature? • Dominance of matter over antimatter • Dark Matter • Dark Energy • Higgs Boson and distribution of mass to particles • How to incorporate quantum version of gravity in SM? Beyond Standard Model • Supersymmetry and shadow particles • Grand Unification of interactions Conclusion • The success of Standard Model to explain observed phenomena • Verification of the subtle predictions of Standard Model by experiments • Particles predicted by Standard Model have been observed except Higgs Boson. • Dependence of Standard Model on Higgs Boson • Supersymmetry – an extension of Standard Model but none of the particles predicted by SUSY has been detected.